AN79L10

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The AN79L10 is a linear regulator from STMicroelectronics, part of their Power Management and Motor Control ICs family. This voltage regulator utilizes basic linear technology to convert an input voltage to a lower, regulated voltage output. The device offers a wide range of applications due to its adjustable output voltage and the ability to drive high currents, up to 1.5A (due to the internal power transistor).

The AN79L10 is a three-terminal adjustable voltage regulator with a series output voltage range from 1.25V to 17V. The regulating element is a medium-voltage, high-current NPN Darlington transistor, that allows high-current output of up to 1.5A. The device offers a wide input multiplication range of 2.7V to 38V, allowing it to be used across all power domains, from low-voltage environments to more heavy-duty industrial applications.

Internal SCR protection will shut-off current in the event of an overload, thus assuring resistance against short-circuit and thermal stress. The AN79L10 contains overheat protection provided by an onboard thermal senor that regulates junction temperature. It also provides a line voltage compensation lead for better voltage regulation in line with load-current changes, which ensures tight output voltage accuracy over line and load changes.

The device is package in a SOT-89-3 package, with all three external terminals pin accessible. It is designed as a fixed-voltage regulated power supply, and can be used with a minimum number of external components, thus having a very small board-space footprint.

At the heart of the AN79L10 is an internal voltage stabilizer, commonly referred to as a series regulator. The series-based linear regulator works by forcing current through the series pass element, in this case a high current NPN Darlington transistor, adjusted to the desired output voltage. As the input voltage connected is greater than the output voltage, the current is forced to flow through the Darlington, thus providing a regulated output voltage.

The amount of current allowed to pass through is regulated with a control loop circuit. The control loop consists of a voltage divider with a feedback resistor connected to a voltage error amplifier. The voltage error amplifier will adjust the Darlington transistor base voltage in order to maintain the desired output voltage. As the pass-element is adjusted, the current flow through the device is also adjusted, providing regulation and stability.

The AN79L10 is well-suited for any application that requires adjustable, regulated power output. It can be used in microprocessors, oscillators, audio amplifiers, laptop computers and other low voltage applications where the input voltage must be regulated. It is also frequently used in automotive DC-DC converters and digital signal processors.

In summary, the AN79L10 is a highly versatile, low-cost, low-dropout linear regulator that is designed to be used in wide range of applications requiring an adjustable, regulated output voltage. It is a very compact device and can be used with a minimum amount of external components, thus saving board-space footprint and costs. The device provides a wide operating range from 2.7V to 38V, and can drive high currents up to 1.5A. It also contains protection from short-circuit and overheating, thus ensuring a safe operation over extended periods of time.

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